[Tcs-lc] concepts of Higher taxa

[Paul Kirk]

>From a nomenclatural point of view I agree but from a TC point of view I still disagree for there is new information about what constitutes Aus Smith SEC. [everyone up to now] after Jones made his observations of the Johnston Atoll population. Which is where I came in to this whole discussion some time ago last year by observing that every (well, almost every) name usage instance is a new TC.
 
Cheers,
 
Paul

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> I disagree; publication of a new species always changes the 
> circumscription of the genus! Since at least one components 
> which define the genus when the new species is described 
> (the new species) have changed 

I agree that both of your examples represent cases where the addition of the 
new species changed the concept of the genus.  But two examples doesn't 
support your use of the word "always" above. Consider this case: 

Genus Aus Smith SEC. [everyone up to now] is comprised of two species:  Aus 
bus Smith SEC. [everyone up to now] found in Hawaii and Johnston Atoll, and 
Aus xus SEC. [everyone up to now] found throughout French Polynesia. 

Later, Jones decides that the population at Johnston Atoll differs from the 
population in Hawaii sufficiently to warrant recognition at the species 
level. Since the type specimen of Aus bus is from Hawaii, Jones describes 
the population at Johnston as Aus jus Jones. 

A new species was described (based on splitting a previously recognized 
single species into two), but the concept circumscription of the genus "Aus" 
(as defined by the total set of its members) did not change. 

Obviously, though, the circumscription of Aus bus Smith SEC. [everyone up to 
now] is different from Aus bus Smith SEC. Jones. 

Thus, I stand by my statement that sometimes a new species description 
changes the genus circumscription, and sometimes it does not. 

Aloha, 
Rich 





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